JPS55158785A - Stealthy watch preventing device for catv system - Google Patents

Stealthy watch preventing device for catv system

Info

Publication number
JPS55158785A
JPS55158785A JP6525679A JP6525679A JPS55158785A JP S55158785 A JPS55158785 A JP S55158785A JP 6525679 A JP6525679 A JP 6525679A JP 6525679 A JP6525679 A JP 6525679A JP S55158785 A JPS55158785 A JP S55158785A
Authority
JP
Japan
Prior art keywords
circuit
stealthy
watching
address
normal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP6525679A
Other languages
Japanese (ja)
Inventor
Yoshibumi Saeki
Kazuyoshi Onda
Kunihiko Nagasawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP6525679A priority Critical patent/JPS55158785A/en
Publication of JPS55158785A publication Critical patent/JPS55158785A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/165—Centralised control of user terminal ; Registering at central

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To prevent the unfair stealthy watching by fixing detachably the address block, the address number of which being specified to the address circuit. CONSTITUTION:The cover of terminal 10 is removed, and the internal circuit is changed for the stealthy watching. In that case, cover switch 42 is opened and detecting circuit 30 transmits the detection signal to action stopping circuit 33. Thus circuit 33 is opened to stop the conduction between transmission/reception circuit 32 and channel converter 34. At the same time, the signal telling the stealty watching is transmitted to modulator circuit 31, and then the stealthy watching is informed to center 1 via circuit 32. And in case the stealthy watcher pulls out the normal address block 36 and then inserts the false block 36, the reset side of FF38 is changed to L from H since idle terminal 37 is pulled out. This change is detected through circuit 30, and the stealthy watching is informed to center 1 through the same action. At the same time, the reception of the program is inhibited. Even though the normal or false address block is inserted to circuit 35, the normal action is impossible for the picture reception because the output of the Q side is held at L by FF38.
JP6525679A 1979-05-26 1979-05-26 Stealthy watch preventing device for catv system Pending JPS55158785A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6525679A JPS55158785A (en) 1979-05-26 1979-05-26 Stealthy watch preventing device for catv system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6525679A JPS55158785A (en) 1979-05-26 1979-05-26 Stealthy watch preventing device for catv system

Publications (1)

Publication Number Publication Date
JPS55158785A true JPS55158785A (en) 1980-12-10

Family

ID=13281641

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6525679A Pending JPS55158785A (en) 1979-05-26 1979-05-26 Stealthy watch preventing device for catv system

Country Status (1)

Country Link
JP (1) JPS55158785A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57129043A (en) * 1981-02-02 1982-08-10 Clarion Co Ltd Address check system
EP0061122A2 (en) * 1981-03-20 1982-09-29 NABU Network Corporation Wired program distribution system tamper detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57129043A (en) * 1981-02-02 1982-08-10 Clarion Co Ltd Address check system
EP0061122A2 (en) * 1981-03-20 1982-09-29 NABU Network Corporation Wired program distribution system tamper detector

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